As tourists increase and competition intensifies, each duty-free shop is confronted with competition in various aspects, including not only sales volume, but also the internal space environment design. When shopping for a long time is busy and crowded, tourists urgently need a rest area to ease fatigue and wait. Nowadays, how to create a resting environment to satisfy tourists is a big challenge for duty-free shops. Therefore, this study compared and analyzed the changes in the design characteristics of the rest space inside the duty free shop in Seoul and analyzed the design characteristics of the rest space environment through case study. In the study, rest spaces should be added to the future design, such as the number of furniture, additional facilities, and disability information, and pay attention to the mobility of the furniture. Rest spaces should be installed on each floor. In addition, it is necessary to select various materials for both the layout of the resting space and the interior to increase the change of color and lighting. It is necessary to separate the resting space from other spaces in order to increase the discrimination of space. The lighting should be soft and create a good atmosphere for the customer.